package cn.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.SubjectDao;
import entity.Subject;

public class SubjectServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public SubjectServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	private SubjectDao sdao = new SubjectDao();

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// Object o = request.getSession().getAttribute("USER_LOGIN");
		// if (o == null) {
		// response.getWriter().print("<script>alert('not
		// login');location='login.jsp';</script>");
		// return;
		// }

		int pageNo = 1;// 显示的页号
		try {
			pageNo = Integer.parseInt(request.getParameter("p"));
			pageNo = pageNo < 1 ? 1 : pageNo;
		} catch (Exception e) {
		}
		List<Subject> list = sdao.paging(pageNo);
		int totalPages = sdao.getTotalPage();

		// 在jsp中展现结果：
		request.setAttribute("datas", list);
		request.setAttribute("pageNo", pageNo);
		request.setAttribute("totalPages", totalPages);
		request.getRequestDispatcher("/WEB-INF/jsp/subjects.jsp").forward(request, response);

		// response.setContentType("text/html");
		// PrintWriter out = response.getWriter();
		// out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01
		// Transitional//EN\">");
		// out.println("<HTML>");
		// out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		// out.println(" <BODY>");
		// out.print(" This is ");
		// out.print(this.getClass());
		// out.println(", using the POST method");
		// out.println(" </BODY>");
		// out.println("</HTML>");
		// out.flush();
		// out.close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
